In February 2019, containerd became an official project within the Cloud Native Computing Foundation (CNCF), just as Kubernetes, Prometheus, Envoy, and CoreDNS have. It can also pull container images from container registries, mount storage, and enable networking for a container. It creates, starts, stops, and destroys containers. What Is containerd?Ĭontainerd is a Docker-developed container runtime that manages the life cycle of a container on a physical or virtual machine (i.e., a host). A container runtime such as containerd, the container runtime developed by Docker, is a component of a container engine that mounts the container and works with the operating system kernel to start and support the containerization process. It’s a software platform that simplifies the process of building, running, managing, and distributing applications, and it achieves this by virtualizing the operating system of the computer on which it’s installed and running.Ĭontainers are the portable, self-contained environments that Docker and other container engines, such as CRI-O, RKT, and LXD, use to package, ship, and run applications. In this way, Docker is really a facilitator and enabler of application development. In other words, it’s a container engine, a system that allows code developed in one computing environment to work in another computing environment. What Is Docker?Īlthough it’s become synonymous with the word “container,” Docker itself isn’t a container but rather a very popular developer tool for creating, working with, and managing containers. ![]() There’s no direct comparison between the two, although they’re definitely related and almost always used together, but typically not interchangeably. Container runtimes are software components that can run containers on a host operating system.Ĭomparing containerd to Docker is a little like comparing a turbocharger to an engine or an air-conditioning system to a house. Containerd (official brand name is written in lowercase) is the container runtime of Docker, an open source containerization platform.
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